3. Before concluding that the system is faulty, check the matters again.
1 Alarm arises
l Did you check state of alarm and take proper action to it? Refer to the manual again for required action
for the alarm.
2
Power does not turn on. Indication lamp does not turn on.
l Check voltage of main and control power sources by a tester if the voltage is in the specification
described in the User’s manual.
3
The Motor does not function.
l Is rotation of the Motor smooth when it is turned manually with power is off? Any stickiness in motion?
Does the rotation axis have any axial play?
(Never disassemble the Motor.)
l Are the control Inputs and Outputs functioning properly?
® Monitor the status of SVON, RUN and IPOS signals by I/O command through handy terminal.
® Check if the voltage of input signal, and 24 V power source are stable with an oscilloscope, etc.
4 Uncontrollable Driver Unit
l Compare the current setting of parameters with the original setting at the installation. Does the PA data
(unique to individual Motor) change?
5
The Motor vibrates. Positioning is inaccurate. Alarm of software thermal arises frequently.
l Are servo parameters VG, VI, PG, FP and NP adjusted?
l Do you fasten the fixing bolts of load and the Motor mounting securely? Check them and fasten them
tightly if necessary.
l Connect FG terminal of the Driver Unit to one point grounding. Ground the Motor and the Driver Unit
respectively. (Refer to User’s Manual for wiring.)
l Is any external interference with rotation in Servo lock state? (It leads the Motor to overheat if external
force is applied to it in servo lock state.)
6
Breaker trip occurs frequently.
l When the system recovers by turning on the power again, take the following action.
à We recommend installing a delay type breaker for a measure against breaker trip.
4. Others
l Combination of the Motor and the Driver Unit shall conform to the specification.
l Be sure to write down the setting of parameters.
l Never modify the cable set.
l Lock the connectors securely, and check for loose fixing screw(s).
l Please keep expendable parts, and backup parts in stock. (Fuses, Motor, Driver Unit, and Cable set for
replace)
l Use alcohol for cleaning. Do not apply thinner.
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